<!DOCTYPE HTML>
<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <style type="text/css" media="screen">
      div {
        -webkit-box-sizing: border-box;
      }
      .solid {
        position: absolute;
        width: 200px;
        height: 200px;
        background-color: green;
      }

      .opacity { opacity: .1; }

      .preserve3d {
        will-change: transform;
        -webkit-transform-style: preserve-3d;
      }
      * { margin: 0; padding: 0; }

    </style>
  </head>
    <div class="opacity solid preserve3d">123</div>

</html>
